Abaixo está uma instrução que descreve uma tarefa de geração de SQL, combinada com uma entrada que fornece mais contexto sobre os esquemas de tabela disponíveis. Escreva o código SQL que responda adequadamente à solicitação
 ###Instrução: Qual concorrente possui um motor vanwall straight-4?
 ###Tabelas: CREATE TABLE georgia_counties_ranked_by_per_capita_income (georgia_counties_ranked_by_per_capita_income_id AUTO_INCREMENT PRIMARY KEY, County VARCHAR, Per capita income VARCHAR, Median household income VARCHAR, Median family income VARCHAR, Population INT, Number of households INT) CREATE TABLE subdivisions (subdivisions_id AUTO_INCREMENT PRIMARY KEY, English Name VARCHAR, Simplified VARCHAR, Traditional VARCHAR, Pinyin VARCHAR, Area VARCHAR, Population INT, Density VARCHAR) CREATE TABLE drivers__&__teams (drivers__&__teams_id AUTO_INCREMENT PRIMARY KEY, Team VARCHAR, Truck(s) VARCHAR, # INT, Driver(s) VARCHAR, Primary Sponsor(s) VARCHAR, Listed Owner(s) VARCHAR, Crew Chief VARCHAR) CREATE TABLE regular_and_capital_gains_tax_rates_for_2009 (regular_and_capital_gains_tax_rates_for_2009_id AUTO_INCREMENT PRIMARY KEY, Marginal Ordinary Income Tax Rate VARCHAR, Single VARCHAR, Married Filing Jointly or Qualified Widow(er) VARCHAR, Married Filing Separately VARCHAR, Head of Household VARCHAR) CREATE TABLE complete_world_championship_grand_prix_results (complete_world_championship_grand_prix_results_id AUTO_INCREMENT PRIMARY KEY, Year INT, Entrant VARCHAR, Chassis VARCHAR, Engine VARCHAR, Points INT)  
SELECT Entrant FROM complete_world_championship_grand_prix_results WHERE Engine = vanwall straight-4